We manufacture, distribute and service acoustic instrumentation systems for the measurement of gas temperature at the industrial level. SEI was founded in 1979, the company is a world leader in the production of Acoustic Pyrometry systems nonintrusive into very high temperature processes (0C to 1927C) in severe and noisy environments. BOILERWATCH MMP II SSX LD System is a patented acoustic measurement technology that provides accurate and constant temperatures in real time. This technology was developed and tested by SEI, Inc in facilities in a large number of thermal processes around the world and over many years.